10Be concentrations in snow at Law Dome, Antarctica following the 29 October 20 and 20 January 2005 solar cosmic ray events

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dc.contributor.authorPedro, JBen_AU
dc.contributor.authorSmith, AMen_AU
dc.contributor.authorDuldig, MLen_AU
dc.contributor.authorKlekociuk, ARen_AU
dc.contributor.authorSimon, KJen_AU
dc.contributor.authorCurran, MAJen_AU
dc.contributor.authorvan Ommen, TDen_AU
dc.contributor.authorFink, Den_AU
dc.contributor.authorMorgan, VIen_AU
dc.contributor.authorGalton-Fenzi, BKen_AU
dc.date.accessioned2022-06-02T21:00:51Zen_AU
dc.date.available2022-06-02T21:00:51Zen_AU
dc.date.issued2009-08en_AU
dc.date.statistics2022-05-20en_AU
dc.description.abstractRecent model calculations have attempted to quantify the contribution of major energetic solar cosmic ray (SCR) events to 10Be production.1,2 In this study we compare modeled 10Be production by SCR events to measured 10Be concentrations in a Law Dome snow pit record. The snow pit record spans 2.7 years, providing a quasi-monthly 10Be sampling resolution which overlaps with the SCR events of 29 Oct 2003 and 20 Jan 2005. These events were calculated to increase monthly 10Be production in the polar atmosphere (>65° S geomagnetic latitude) by ~60% and ~120% above the GCR background, respectively2. A strong peak in 10Be concentrations (>4σ above the 2.7 y mean value) was observed ~1 month after the 20 Jan 2005 event. By contrast, no signal in 10Be concentrations was observed following the weaker 29 Oct 2003 series of events. The concentration of 10Be in ice core records involves interplay between production, transport, and deposition processes. We used a particle dispersion model to assess vertical and meridional transport of aerosols from the lower stratosphere where SCR production of 10Be is expected to occur, to the troposphere from where deposition to the ice sheet occurs. Model results suggested that a coherent SCR production signal could be transported to the troposphere within weeks to months following both SCR events. We argue that only the 20 Jan 2005 SCR event was observed in measured concentrations due to favorable atmospheric transport, relatively high production yield compared to the 29 Oct 2003 event, and a relatively high level of precipitation in the Law Dome region in the month following the event. This result encourages further examination of SCR signals in 10Be ice core data. © 2009 World Scientific Publishingen_AU
dc.description.sponsorshipJoel Pedro is grateful for research funding from an Australian Institute of Nuclear Science and Engineering Postgraduate Research Award and an Australian Postgraduate Award. The Bartol Research Institute neutron monitor program is supported by National Science Foundation grant ATM-0527878.en_AU
dc.identifier.booktitleAdvances in Geosciences, Volume 14: Solar Terrestrial (ST)en_AU
dc.identifier.citationPedro, J. B., Smith, A. M., Duldig, M. L., Klekociuk, A. R., Simon, K. J., Curran, M. A. J., van Ommen, T. D., Fink, D. A., Morgan, V. I., & Galton-Fenzi, B. K. (2009). 10 Be concentrations in snow at Law Dome, Antarctica following the 29 October 2003 and 20 January 2005 solar cosmic ray events. In Duldig, M. (Ed.), Advances in Geosciences, Volume 14: Solar Terrestrial (ST) (pp. 285-303). doi:10.1142/9789812836205_0020en_AU
dc.identifier.editorsDuldig, Men_AU
dc.identifier.isbn9789814469517en_AU
dc.identifier.pagination285-303en_AU
dc.identifier.urihttps://doi.org/10.1142/9789812836205_0020en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/13262en_AU
dc.identifier.volume14en_AU
dc.language.isoenen_AU
dc.publisherWorld Scientificen_AU
dc.relation.ispartofseriesAdvances in Geosciences;14en_AU
dc.subjectBeryllium 10en_AU
dc.subjectSnowen_AU
dc.subjectAntarcticaen_AU
dc.subjectSolar activityen_AU
dc.subjectDrill coresen_AU
dc.subjectSolar radiationen_AU
dc.title10Be concentrations in snow at Law Dome, Antarctica following the 29 October 20 and 20 January 2005 solar cosmic ray eventsen_AU
dc.typeBook chapteren_AU
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